SR-72: US secret hypersonic jet to allegedly break sound barrier in 2025 | Believed to be a top-secret project of the US Air Force, the SR-72 is touted to reach over 4,000 mph (6,437 kph), making i...

L4sBot@lemmy.world · 1 year ago

SR-72: US secret hypersonic jet to allegedly break sound barrier in 2025 | Believed to be a top-secret project of the US Air Force, the SR-72 is touted to reach over 4,000 mph (6,437 kph), making i...

CaptainSpaceman@lemmy.world · 1 year ago

Can you explain what youre referring to?

grue@lemmy.world · 1 year ago

I don’t believe for a second that the Air Force hasn’t built something faster than the SR-71 in forty years, but I do believe they wouldn’t have told us about it.